[RFC PATCH v2 02/22] target/arm: Handle HCR_EL2 accesses for bits introduced with FEAT_NMI

[Jinjie Ruan via]

FEAT_NMI defines another new bit in HCRX_EL2: TALLINT. When the
feature is enabled, allow this bit to be written in HCRX_EL2.

Signed-off-by: Jinjie Ruan <ruanjin...@huawei.com>
---
 target/arm/cpu-features.h | 5 +++++
 target/arm/helper.c       | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/target/arm/cpu-features.h b/target/arm/cpu-features.h
index 7567854db6..2ad1179be7 100644
--- a/target/arm/cpu-features.h
+++ b/target/arm/cpu-features.h
@@ -681,6 +681,11 @@ static inline bool isar_feature_aa64_sme(const 
ARMISARegisters *id)
     return FIELD_EX64(id->id_aa64pfr1, ID_AA64PFR1, SME) != 0;
 }
 
+static inline bool isar_feature_aa64_nmi(const ARMISARegisters *id)
+{
+    return FIELD_EX64(id->id_aa64pfr1, ID_AA64PFR1, NMI) != 0;
+}
+
 static inline bool isar_feature_aa64_tgran4_lpa2(const ARMISARegisters *id)
 {
     return FIELD_SEX64(id->id_aa64mmfr0, ID_AA64MMFR0, TGRAN4) >= 1;
diff --git a/target/arm/helper.c b/target/arm/helper.c
index 90c4fb72ce..a3062cb2ad 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -6056,6 +6056,11 @@ static void hcrx_write(CPUARMState *env, const 
ARMCPRegInfo *ri,
         valid_mask |= HCRX_MSCEN | HCRX_MCE2;
     }
 
+    /* FEAT_NMI adds TALLINT */
+    if (cpu_isar_feature(aa64_nmi, env_archcpu(env))) {
+        valid_mask |= HCRX_TALLINT;
+    }
+
     /* Clear RES0 bits.  */
     env->cp15.hcrx_el2 = value & valid_mask;
 }
-- 
2.34.1